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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e296da60730e84858d7f862d31ba6a0582f233b78ccd091e041b895979ab1bc' 
  AND token = '75t8jsvL3VkGEvBImMjaL/BfQE1kApFVuWPbZFv635s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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