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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47dc0b5ca2edb0b4983a5b7080daeb07b9ce432c2c3ed874945283fed8d249bc' 
  AND token = 'icqOnBAua581R+TY+xM9gSXw3lZUWNFh70sRNS9OczQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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