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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8008b5a87717d2459d32bd08d17b6a10a08c31637a628f06cc6636d53acfa3b' 
  AND token = 'jC4U9IxClv2WvSpfR81VJH+9Q3NtxGTaWQUcifdL4BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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