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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8a49136513ccfb768ef2f10e63139dfa21a38f92423e4a20a62b3638e87f10' 
  AND token = 'uioIGs5UBsFOkb8k0lw5GeIq4nX6eqbg7dDJKfiM3I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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