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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4500d90c5e204cdc2574edc28c85d721c4b762cf970a2f6b629850b89731e58' 
  AND token = 'L1WTNvgrBbd9YIAUfa8zHLVsEG3W1E9EV32P9GlC7iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00136

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}