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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55b04f0eecb5d6ee3fbd4201d0c15a5d8286c7d9abe644e2b3693bca80a7067' 
  AND token = 'koEyeVGODi6pP70BEOlyuXEe2m3T5c9ouhc5PkBGQCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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