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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3670f82f87c6507a15478c5c4144e77c56ffc9f975f0a8a1e0f7dc21323efa72' 
  AND token = 'J3LU2nJjvmhJGz52RN5yljnTqwJus1VMUJc7kBwlOKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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