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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607138cd0e593a2b936e9cb3b4ee85a5e08bf35d488a797e3c2a65471a5c5e0f' 
  AND token = 'cZc0mlittpE6lBPkxMBARCkY0DYGlWuCyPmpMva6B0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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