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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb1af06302270669f881f69b2127070f83e85fe00838c52138a371d861dd777' 
  AND token = '318z3Po62nw4PZJCA/M9a3iJwK+Wj02pUDZyyNku304=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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