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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24b5f79d8d81b13a3880c3045d67132b997f6c787dfc1bd5b3c85d10947e273' 
  AND token = 'wPeVu41x5VmeIxc/5RQPdktDAP3JXruu2fHEkFTm0wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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