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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec7447bb6c98b1a18163578b66169cb59f8b54916c9c73c48c8c4fa9462b682' 
  AND token = 'h35r3AD4ykcrZG73W6pi79yNw2QTCEf6oR4rNDgag1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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