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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a1dcfe4d5de294787eb2e66cc117cde39b7e0909fda2db6a2a50cbc068cdb9' 
  AND token = 'rplEA9b9Knys+AWCGgVBaHlFrYK91CR+uhdLvbdJ1kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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