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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef7c2e8d85f4b59089b3e352d279ce8e5387070dc9ffb22e6ebd91c9f5f49d0' 
  AND token = 'YrnsT57AmWTS5cJOEPsTue5rKAkqg47MejkyVq5Nl/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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