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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823ac432d5ee03a779fc15c25b4937c1963f800c5938eab1ade89c20d4839d49' 
  AND token = '4j3L+L507DHTjcoS0Dzkct7CS6ZnN4Ni+Cp3Zd6CPus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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