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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47737d386861df239a3385776abc041d8712af776ba0eafe0abf89a5c2eb487b' 
  AND token = 'm3i3i9R+CqVukzW2AHmEezvcXYVmz5ayP0+exW6eNzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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