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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000ab023b3487d63db2fe0f3290ff08b8c022c9b5c70b5d72d96ac8af0f2ac32' 
  AND token = 'QZMVkIno5FLPQ1HDr/Me8h0O+LIn4/sE/Cm61mCQJGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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