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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '800c21cdf3cc43555c850850e1000689a1c21adf31ba77dac789f3c1625ccad9' 
  AND token = 'Mz1rbYVFzReQFQWvw07TL8AebJtPo/a1YsupzwRJeKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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