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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5407a34995b292763946ba4a13c7734b81009a89a6baf8eaf796536867972a09' 
  AND token = 'ALhbI8GK7391qpvUeDJ2O29KTkLAzeD+e450VVj9mko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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