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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c5ecf801191117ebef37172b0a7bf82174d38141a635f9095eeccb2c2160df' 
  AND token = 'XCRuZYFTEgStVMmoCH3R0Nu6zJo21AAfT8OC9OG/0/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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