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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a7b0eb958a7395bd1111222a2cf062f5c8a0e5983c26fc42ba0c36bf43cc54' 
  AND token = 'PPYyx0v3a1ClhzUa5BKqpu0qsQptpJJU1vap5upO2QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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