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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec5772c28883160e8b397951f17948c13447c538475b5c4b2381d4ae07ce29e' 
  AND token = 'oObaoNAzTReYVRhFrrWiV+F+36IRinKH14kMYh4B66Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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