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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617ca1f38a0944d656bd91f1960ae33607ca9d612e4c1c09332c16e0bfa8b91d' 
  AND token = '4y+jasJeSXRunYH1s/GM1fqb7/rfTu+9cDSmzxL9tyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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