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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a0b10f8fbdbec268f071e6c428fd66ffc8f0649f081d9cad8805400f35fe5a' 
  AND token = 'bYKxojqSU2k32FJiNEW4xsfVs1B7hBegbE4wKgS98Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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