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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f61ab9f184d6069074852e0fde6e14d2681391dc7ad4c7bf284e67410d1e7db' 
  AND token = 'R3w8Tk5bcX7Zc0NMVlPMbrcaQeWm63WPrMcsQz/NKMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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