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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa188867366b5ca0a47ba3839276d41393c3eb8e54f27e3e8203083490121534' 
  AND token = 'M4UZjKbC/bpYgoYrK57C+XcIW03yG00q6W6KvOAR2qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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