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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39220519dc2bf338b21c5b362cd58f6bd43f10576991616678db4222ac9a0664' 
  AND token = '0CMFvE6iP2BWR/Uz3342l1S9aB6m7UULakjobSgN+dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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