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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82f4938610e4917671c1eb7e03880bbcb0403a1d67a5147e4a11b9f584ecaa8' 
  AND token = '1ob5zvbCVL/OAixpfTtUT/6eWh8nTRlPrk0Qh7U5lo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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