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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a50744cd0bd276ba92b48d4c26a2cbe07e901a496561f5cc04951d3f013274e' 
  AND token = 'Dh5lvAl0N30alO7vW9FCqIt9BSEn2aAYTjL5WB9qthQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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