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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f33a5bffb1d786e0b263917c91f3d2f12899f803e38df6bce9bff166341f08' 
  AND token = 'SxINqn8B4RPqu3L+97w3cL19G6VMjR8HI1GYnRT+VCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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