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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850febaf1c59d51834d2ea1b9b00c4f80d3165122facd0594065593293a1e5c5' 
  AND token = 'x3zDA35dtmdzMLeQfkjtljXdezDcml0QW88xYbtrmsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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