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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc687bce02b79d0f20f0c85855debf70df7ac05fbc2a8930a51a6ede5de3a999' 
  AND token = 'qSTtQLhCLhAzTARYe2K7qNYtp0yeS+sNbtADIq9TsT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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