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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca95689d6657d25679c20982f2c869a23ec5a6b828cf54cd20a8a13f3e4413bc' 
  AND token = 'OVMNUPHjOzWViWUmV1ud++fKK85ukW1v+m6EA/7J4Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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