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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990f36c00e9ae54294a28b2d110419eb7e91ecf2cd4906677e555f285b03891f' 
  AND token = 'BRruuVvx7kkvajsurz+rC1MIJ5mO03a75bTx/C+Em+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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