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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184a4ba9ac53c848dbe4b1bf0450d1de2c494d8c77a82ed45df6112bb051035c' 
  AND token = 'N0cIZ8F/GbxH9HjN2Kz9CsJ0uvePUlzc6L/f5/pWhHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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