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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb462c0a98d60e1b99447ac5cb2d12975c44267514a4f0943af55dd4f6172713' 
  AND token = 'CAnhTy6YufGKwrdLHShEOPH8Tj2JdzupHfytXw9dwoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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