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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b09d1d301b22ed2db1d30b61bd604dbce138ad6ba2ade19da6f2c77e7630a4' 
  AND token = 'TDmA5EZCasTYPZmZGHYRsIc5AXvEOrfE/rAoMKqL47Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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