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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec710f88d4f23c97b06a8e051380156beb7696ca35ec5c2d23eed764ad1de5d9' 
  AND token = '6g41rj6DUgSop9m0YCvL1AtG6qIJWUrNRyaKH33kZVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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