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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8878b13c03241b8b1e3de63597bb3fc6a8b91c73faf203058b990eeb10183017' 
  AND token = 'FkIV1Kb/2ukwzvuoURi/BIN8C9VYpLaMpdekM/N8QLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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