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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62bb0175ac6bbc34d6e2ccd82d7eb2740e742840de7140fb55d9f08bc798c8f2' 
  AND token = 'umbD1n1HB/zuWf+lbyGrPjBDDC5PtM3KBVbiH8YItFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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