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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93dc91fa886154155d6e0afd1ac13b2bc80923934aba4c52c6af4298275090ae' 
  AND token = 'HQkQhRyBt1ychf4veh6jZslcbL8TxO++YKzz59VNDhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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