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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea300c30d9a1ceed7cb59abac6603ff98c86158c46cd3ebf3ab93c08f576ab9' 
  AND token = 'R9oN28JrT9+Rf5Uv0Ieq64V0owQAfu08nOjEQPhY048=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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