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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c047860eb869d9b0311f4dd2c10c8bd84f46066f8d99f08b4737f08412a27b8' 
  AND token = 'PJv/89MNDvrb6DP74Fh88a40N1EakTPY/H48j68r+GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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