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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e69b766fe5179c572959ba9a3b3f2dea1b4a179c75b5922e39b0dacfd68ca4' 
  AND token = 'RndIn+wgaDbxv6nSO+BLZBNmj4jBYEoRma/pnNX6l6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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