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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2efa5efc39c5df3bd6dcf32189e4b1e7d2ecceb51f07653bf9376c3c45b792bc' 
  AND token = 'FAoghRrih+7PhThIFFfPevyAuoZMG1/BLuuQw4wtzBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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