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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb33d0d3e09c298ea7c4270291c2c76d0f39d4dc87f8d6910aee969667808669' 
  AND token = 'bMI5/lGm+kkVsruUlfoAsgvQjlt2n2KOl4reiQEa9vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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