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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a60cf0e5fbe8a5208fd832f3137d4774a74a60b20d85ea2f093141d2af9b365' 
  AND token = 'jxrlacFqhTIxgtsoLtgLWQUNQmP2IJ3e2WOTDGW/MJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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