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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1efa045386430b1d357fcba58cdd6d9243c7fee43f785215209561657c9ae2' 
  AND token = 'BYfu25XNCCJ2G2u8YyttQ1NucKsxz8NIFKFIR34wWg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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