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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6630a9904c5e5fef1305b25cac9b08e61151111ae19d07f5054de96ba2980c6' 
  AND token = '0fKYjak2BlBNDZMu85k0KD/IRqZYGZAp1aevc8B5p+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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