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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2be130bdf8c4d0387e0a5361912a6af9deb234bbcf3edf29e2ea08dc977e739' 
  AND token = 'Z/RAXwMFoNb+qd2yIIAxB2Nn7Za/OM4ud7X3QZh0tgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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