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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9909365a4054eb5a7a613380fcd7fd69899ec7b4828cb32bbba2a376b7f6dc44' 
  AND token = '6rlEl39lm1w0weOZgKgZN772ec6DrHCjYwIh3i7GQ1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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