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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86aa12e233be6c124825311b6c19c8041b57ee4a2d735934a2c3a8c90f1ff98a' 
  AND token = 'M6NoCq1w9cYX5wPBy5tIy7AOindxB+of18PavXFx7Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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