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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e70181300a90e422b61598265875fec497d4a7b0b6f118297c0396f9f3e2b4c' 
  AND token = 'nDgOELmRl825+T3clRkc49U+RnXNiCzBMikdRAqCT/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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